﻿<!DOCTYPE html>

<head>
	<meta charset="UTF-8" />
	<title>JS对象实战案例  图片滑动切换效果</title>
	<script type="text/javascript">
		var $ = function(id) {
			return "string" == typeof id ? document.getElementById(id) : id;
		};

		var Extend = function(destination, source) {
			for(var property in source) {
				destination[property] = source[property];
			}
			return destination;
		}

		var CurrentStyle = function(element) {
			return element.currentStyle || document.defaultView.getComputedStyle(element, null);
		}

		var Bind = function(object, fun) {
			var args = Array.prototype.slice.call(arguments).slice(2);
			return function() {
				return fun.apply(object, args.concat(Array.prototype.slice.call(arguments)));
			}
		}

		var Tween = {
			Quart: {
				easeOut: function(t, b, c, d) {
					return -c * ((t = t / d - 1) * t * t * t - 1) + b;
				}
			},
			Back: {
				easeOut: function(t, b, c, d, s) {
					if(s == undefined) s = 1.70158;
					return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
				}
			},
			Bounce: {
				easeOut: function(t, b, c, d) {
					if((t /= d) < (1 / 2.75)) {
						return c * (7.5625 * t * t) + b;
					} else if(t < (2 / 2.75)) {
						return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
					} else if(t < (2.5 / 2.75)) {
						return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
					} else {
						return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
					}
				}
			}
		}

		//容器对象,滑动对象,切换数量
		var SlideTrans = function(container, slider, count, options) {
			this._slider = $(slider);
			this._container = $(container); //容器对象
			this._timer = null; //定时器
			this._count = Math.abs(count); //切换数量
			this._target = 0; //目标值
			this._t = this._b = this._c = 0; //tween参数

			this.Index = 0; //当前索引

			this.SetOptions(options);

			this.Auto = !!this.options.Auto;
			this.Duration = Math.abs(this.options.Duration);
			this.Time = Math.abs(this.options.Time);
			this.Pause = Math.abs(this.options.Pause);
			this.Tween = this.options.Tween;
			this.onStart = this.options.onStart;
			this.onFinish = this.options.onFinish;

			var bVertical = !!this.options.Vertical;
			this._css = bVertical ? "top" : "left"; //方向

			//样式设置
			var p = CurrentStyle(this._container).position;
			p == "relative" || p == "absolute" || (this._container.style.position = "relative");
			this._container.style.overflow = "hidden";
			this._slider.style.position = "absolute";

			this.Change = this.options.Change ? this.options.Change :
				this._slider[bVertical ? "offsetHeight" : "offsetWidth"] / this._count;
		};
		SlideTrans.prototype = {
			//设置默认属性
			SetOptions: function(options) {
				this.options = { //默认值
					Vertical: true, //是否垂直方向（方向不能改）
					Auto: true, //是否自动
					Change: 0, //改变量
					Duration: 50, //滑动持续时间
					Time: 10, //滑动延时
					Pause: 2000, //停顿时间(Auto为true时有效)
					onStart: function() {}, //开始转换时执行
					onFinish: function() {}, //完成转换时执行
					Tween: Tween.Quart.easeOut //tween算子
				};
				Extend(this.options, options || {});
			},
			//开始切换
			Run: function(index) {
				//修正index
				index == undefined && (index = this.Index);
				index < 0 && (index = this._count - 1) || index >= this._count && (index = 0);
				//设置参数
				this._target = -Math.abs(this.Change) * (this.Index = index);
				this._t = 0;
				this._b = parseInt(CurrentStyle(this._slider)[this.options.Vertical ? "top" : "left"]);
				this._c = this._target - this._b;

				this.onStart();
				this.Move();
			},
			//移动
			Move: function() {
				clearTimeout(this._timer);
				//未到达目标继续移动否则进行下一次滑动
				if(this._c && this._t < this.Duration) {
					this.MoveTo(Math.round(this.Tween(this._t++, this._b, this._c, this.Duration)));
					this._timer = setTimeout(Bind(this, this.Move), this.Time);

				} else {
					this.MoveTo(this._target);
					this.Auto && (this._timer = setTimeout(Bind(this, this.Next), this.Pause));
				}
			},
			//移动到
			MoveTo: function(i) {
				this._slider.style[this._css] = i + "px";
			},
			//下一个
			Next: function() {
				this.Run(++this.Index);
			},
			//上一个
			Previous: function() {
				this.Run(--this.Index);
			},
			//停止
			Stop: function() {
				clearTimeout(this._timer);
				this.MoveTo(this._target);
			}
		};
	</script>
	<style type="text/css">
		.num {
			position: absolute;
			right: 5px;
			bottom: 5px;
		}
		
		.num li {
			float: left;
			list-style: none;
			color: #fff;
			text-align: center;
			line-height: 16px;
			width: 16px;
			height: 16px;
			font-family: Arial;
			font-size: 12px;
			cursor: pointer;
			margin: 1px;
			border: 1px solid #707070;
			background-color: #060a0b;
		}
		
		.num li.on {
			line-height: 18px;
			width: 18px;
			height: 18px;
			font-size: 14px;
			border: 0;
			background-color: #ce0609;
			font-weight: bold;
		}
		
		.container,
		.container img {
			width: 280px;
			height: 200px;
		}
		
		.container {
			border: 1px solid #333;
		}
		
		.container img {
			border: 0;
		}
	</style>
</head>

<body>
	<div class="container" id="idContainer">
		<table id="idSlider" border="0" cellpadding="0" cellspacing="0">
			<tr>
				<td>
					<a href="#"><img src="img/hf5.jpg" alt="六安天堂寨国际5A级风景区" /></a>
				</td>
			</tr>
			<tr>
				<td>
					<a href="#"><img src="img/hf4.jpg" alt="颍上八里河国家5A级风景区" /></a>
				</td>
			</tr>
			<tr>
				<td>
					<a href="#"><img src="img/hf1.jpg" alt="合肥野生动物园" /></a>
				</td>
			</tr>
		</table>
	</div>
	<br />
	<br />
	<div class="container" id="idContainer2">
		<table id="idSlider2" border="0" cellpadding="0" cellspacing="0">
			<tr>
				<td>
					<a href="#"><img src="img/hf1.jpg" alt="合肥野生动物园" /></a>
				</td>
				<td>
					<a href="#"><img src="img/hf2.jpg" alt="合肥天鹅湖" /></a>
				</td>
				<td>
					<a href="#"><img src="img/hf3.jpg" alt="合肥天鹅湖万达广场" /></a>
				</td>
				<td>
					<a href="#"><img src="img/hf4.jpg" alt="合肥天鹅湖万达广场" /></a>
				</td>
				<td>
					<a href="#"><img src="img/hf5.jpg" alt="合肥天鹅湖万达广场" /></a>
				</td>
			</tr>
		</table>
		<ul class="num" id="idNum">
		</ul>
	</div>
	<br />
	<div>
		<input id="idAuto" type="button" value="停止" />
		<input id="idPre" type="button" value="&lt;&lt;" />
		<input id="idNext" type="button" value="&gt;&gt;" />
		<select id="idTween">
			<option value="0">默认缓动</option>
			<option value="1">方式1</option>
			<option value="2">方式2</option>
		</select>
	</div>
	<script>
		new SlideTrans("idContainer", "idSlider", 3).Run();

		///////////////////////////////////////////////////////////

		var forEach = function(array, callback, thisObject) {
			if(array.forEach) {
				array.forEach(callback, thisObject);
			} else {
				for(var i = 0, len = array.length; i < len; i++) {
					callback.call(thisObject, array[i], i, array);
				}
			}
		}

		var st = new SlideTrans("idContainer2", "idSlider2", 5, {
			Vertical: false
		});

		var nums = [];
		//插入数字
		for(var i = 0, n = st._count - 1; i <= n;) {
			(nums[i] = $("idNum").appendChild(document.createElement("li"))).innerHTML = ++i;
		}

		forEach(nums, function(o, i) {
			o.onmouseover = function() {
				o.className = "on";
				st.Auto = false;
				st.Run(i);
			}
			o.onmouseout = function() {
				o.className = "";
				st.Auto = true;
				st.Run();
			}
		})

		//设置按钮样式
		st.onStart = function() {
			forEach(nums, function(o, i) {
				o.className = st.Index == i ? "on" : "";
			})
		}

		$("idAuto").onclick = function() {
			if(st.Auto) {
				st.Auto = false;
				st.Stop();
				this.value = "自动";
			} else {
				st.Auto = true;
				st.Run();
				this.value = "停止";
			}
		}
		$("idNext").onclick = function() {
			st.Next();
		}
		$("idPre").onclick = function() {
			st.Previous();
		}

		$("idTween").onchange = function() {
			switch(parseInt(this.value)) {
				case 2:
					st.Tween = Tween.Bounce.easeOut;
					break;
				case 1:
					st.Tween = Tween.Back.easeOut;
					break;
				default:
					st.Tween = Tween.Quart.easeOut;
			}
		}

		st.Run();
	</script>
</body>

</html>